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To evaluate the visual outcomes after laser-assisted in situ keratomileusis (LASIK) surgery for the correction of myopia or myopic astigmatism using 2 different wavefront aberrometers: WaveScan (Abbott Medical Optics, Inc, Santa Ana, CA) versus iDesign (Johnson & Johnson Vision Care Inc, Jacksonville, FL).
This retrospective study analyzed 200 eyes from 100 patients who underwent wavefront-guided LASIK performed by 2 different surgeons for myopia and myopic astigmatism using the VisX S41R excimer laser. Wavefront data was derived from WaveScan (102 eyes) or iDesign (98 eyes), a new generation Hartman-Shack aberrometer. Charts were analyzed for pre-operative uncorrected distance visual acuity (UDVA) and refractive error (as determined by WaveScan or iDesign aberrometers), and UDVA on post-op day 1, post-op week 1, post-op week 2, post-op months 1, 2, 3, 4, 5, 6 and 12 if available. Visual acuities were converted and reported into logMAR format for statistical analysis.
Preoperative spherical equivalents differed significantly between the WaveScan (-1.83 ± 0.04 D) and iDesign (-3.29 ± 0.16 D) groups with more myopic patients treated by iDesign. Similarly, preoperative UDVA differed significantly between groups with Wavescan -0.01±0.01 and iDesign -0.07±0.01 (logMAR). Final postoperative UDVA differed significantly with iDesign averaging -0.07± 0.01 and WaveScan -0.01 ± 0.01. A monocular UDVA of 20/10, 20/15, 20/20 and 20/25 was achieved in 5%, 30%, 85% and 97% of Wavescan-treated eyes respectively and achieved in 11%, 57%, 89% and 99% in iDesign-treated eyes respectively. All data reported as average ± standard error. All p-values mentioned above are <0.01.
Despite higher preoperative myopia in the iDesign group, more patients in the iDesign group achieved superior final UDVA than the WaveScan group. More than half of iDesign patients achieved 20/15 vision or better versus less than a third of WaveScan patients. Although “20/happy” was the previous goal, “Better than Perfect Vision” can be achieved.